D
DH1
Hello,
there are many ways to build a sinewave generator however todate I
have not seen a med-low cost high spec. minimal IC design that surely
is now possible. The ICL038 etc. are large ICs with eccentric
intercoupled freq./duty cycle adjustment & the NTE864 version costs
$54 at Mouser, while high pin count expensive DDS chips exist that
require programming. Many low pin count square wave generators do
exist (e.g., the SOT23-5 LTC1799) and can be coupled with, e.g., 8th
order elliptical low pass switched capacitor filters for a two chip
solution. One interesting chip is the MSI MSLOSC SO-8 programmable DDS
sinewave generator that also requires an external clock (where to
purchase such a chip ?). Low pin count uC's with internal D/A's can
also be programmed, with RC or active filtering added, and optional
crystals.
What would be useful for many applications is a low cost low power
low distortion one resistor programmable sinewave generator in an
SC23-5 pin package with GND, VCC, R_freq and Out pins (similar in
concept to the LTC1799). The fifth pin could be used for an optional
gain setting resistor. An internal high precision capacitor completes
the timing reference, and frequency accuracy could be, e.g., R_freq
accuracy+0.1% (though even 1% would be useful). Instead of R-freq
current programming could be used with graceful transition from one
freq. to another for modulation etc.
A variation on this is an SPI programmable MEMs clock version for
very high freq. accuracy.
DH
there are many ways to build a sinewave generator however todate I
have not seen a med-low cost high spec. minimal IC design that surely
is now possible. The ICL038 etc. are large ICs with eccentric
intercoupled freq./duty cycle adjustment & the NTE864 version costs
$54 at Mouser, while high pin count expensive DDS chips exist that
require programming. Many low pin count square wave generators do
exist (e.g., the SOT23-5 LTC1799) and can be coupled with, e.g., 8th
order elliptical low pass switched capacitor filters for a two chip
solution. One interesting chip is the MSI MSLOSC SO-8 programmable DDS
sinewave generator that also requires an external clock (where to
purchase such a chip ?). Low pin count uC's with internal D/A's can
also be programmed, with RC or active filtering added, and optional
crystals.
What would be useful for many applications is a low cost low power
low distortion one resistor programmable sinewave generator in an
SC23-5 pin package with GND, VCC, R_freq and Out pins (similar in
concept to the LTC1799). The fifth pin could be used for an optional
gain setting resistor. An internal high precision capacitor completes
the timing reference, and frequency accuracy could be, e.g., R_freq
accuracy+0.1% (though even 1% would be useful). Instead of R-freq
current programming could be used with graceful transition from one
freq. to another for modulation etc.
A variation on this is an SPI programmable MEMs clock version for
very high freq. accuracy.
DH